def __init__(self, shape, name=None):
super(Input, self).__init__(name=name)
if isinstance(shape, tf.TensorShape):
shape = tf_utils.shape_to_tuple(shape)
self.shape = as_tuple(shape)
def fail_if_shape_invalid(self, input_shapes):
n_input_layers = len(input_shapes)
try:
gate_shape = input_shapes[self.gate_index]
except IndexError:
raise LayerConnectionError(
"Invalid index for gating layer. Number of input "
"layers: {}. Gating layer index: {}"
"".format(n_input_layers, self.gate_index))
other_shapes = exclude_index(input_shapes, self.gate_index)
if gate_shape and len(gate_shape) != 2:
raise LayerConnectionError(
"Output from the gating network should be 2-dimensional. "
"Output shape from gating layer: {!r}"
"".format(gate_shape))
n_expected_networks = gate_shape[-1]
# Note: -1 from all layers in order to exclude gating layer
if n_expected_networks != (n_input_layers - 1):
raise LayerConnectionError(
"Gating layer can work only for combining only {} networks, "
"got {} networks instead."
"".format(n_expected_networks, (n_input_layers - 1)))
for shape in other_shapes:
if not shape.is_compatible_with(other_shapes[0]):
raise LayerConnectionError(
"Output layer that has to be merged expect to "
"have the same shapes. Shapes: {!r}"
"".format(tf_utils.shape_to_tuple(other_shapes)))
def __reduce__(self):
parameters = self.get_params(with_network=False)
# We only need to know placeholders shape
# in order to be able to reconstruct it
parameters['target'] = tf_utils.shape_to_tuple(
parameters['target'].shape)
args = (self.network, parameters)
return (self.__class__, args)
def check_if_networks_compatible(networks):
input_shapes = []
output_shapes = []
for i, network in enumerate(networks):
input_shapes.append(network.input_shape)
output_shapes.append(network.output_shape)
for shape in input_shapes:
if not shape.is_compatible_with(input_shapes[0]):
raise ValueError(
"Networks have incompatible input shapes. Shapes: {}"
"".format(tf_utils.shape_to_tuple(input_shapes)))
for shape in output_shapes:
if not shape.is_compatible_with(output_shapes[0]):
raise ValueError(
"Networks have incompatible output shapes. Shapes: {}"
"".format(tf_utils.shape_to_tuple(output_shapes)))
def get_output_shape(self, *input_shapes):
input_shapes = [tf.TensorShape(shape) for shape in input_shapes]
first_shape = input_shapes[0]
if len(input_shapes) < 2:
raise LayerConnectionError(
"Layer `{}` expected multiple inputs. Input shapes: {}"
"".format(self.name, tf_utils.shape_to_tuple(input_shapes)))
if any(shape.ndims is None for shape in input_shapes):
return tf.TensorShape(None)
for shape in input_shapes:
if not shape.is_compatible_with(first_shape):
formatted_shapes = tf_utils.shape_to_tuple(input_shapes)
raise LayerConnectionError(
"Input shapes to the `{}` layer have incompatible shapes. "
"Input shapes: {}, Layer: {}"
"".format(self.name, formatted_shapes, self))
return first_shape
def targets(self):
placeholders = []
for layer in self.output_layers:
placeholder = tf.placeholder(
tf.float32,
shape=tf_utils.shape_to_tuple(layer.output_shape),
name="placeholder/target/{}".format(layer.name),
)
placeholders.append(placeholder)
return make_one_if_possible(placeholders)